ethomaz on 23 November 2015
PS4 looks way too low.
And to be fair Xbone way too high but I don't have proof in this case.
This is the PS4 issue here:
End of Sep VGC: 26.5m
End of Sep Shipped: 29.3m
Unless you believe there is near 3m on shelves at end of Sep then PS4 is heavy UNDERtracked.